Process of boring holes in rock, &amp;c.



P'mnfed Mar. 4, |902.

FLVH. nAvls. PROCESS 0F BORING HOLES' IN BUCK, 8:6.

(App'umion med Aug, s, 1901.)

(No Modal.)

f. f f l .1. 1

fl//f///// ///1/////// lNvENTon y ATT NEYS WITNESSES' Tn: mums PETERS co.. Prluvuumo.. WASHINGTON, D. cA

UNITED STATES PATENT OFFICE.

. FRANCIS I-I. DAVIS, CE NEWYCEIQN. Y., ASSIGNCR To DAVIS CALYX DRILL COMPANY, CF NEW'YCRK, N. Y., A `CORPORATION oF WEST VIRGINIA.

PROCESS OF BORING HOLESIN ROCK, 80C.

SPESJIFJIUATJEON forming partl of Letters Patent No. 694,534, dated March 4, 1902. v

Application filed August 8, 1901.

To all whom it may concern.-

Be it known that I, FRANCIS H. DAVIS, a subject of the King of Great Britain, and a resident of the city, county, and State of New York, have invented certain new and useful Improvements in Processes of Boring Holes in Rock or Similar Material in the Earths Strata, of which the following is a specification, reference being had to the accompanying draw- Io ings, forming apart thereo f My improved process -refersparticularly to the boring of holes in rock or similar material forming a part of the earths strata, and consists in milling or grinding an annular channel in the same with a free or loose material, in forcing water into the hole to carry up the millings or grindings as they are produced, in so regulating the force of water that the same shall, after the hole has been zo bored a predetermined distance, be sufficient to carry up` the millingsor grindings a portion of the distance only to thesurface of the hole, the force being so regulated as to be not sufficient to carry the milling or grindingz5 material therewith, and in catching the said millings or grindings so carried upwardly at a point intermediate of the top and bottom of the hole. Y

My improved process permits the use of the 3o shot system, as it is known inthe art, for boring to a very much greater depth than has heretofore been possible. Heretofore it has only been possible to use the shot system for holes of inconsiderable depth, for the force' 0f water necessary to be used in carrying up the millings or grindings from the bottom to the surfaceof the hole where the hole is of Yco'n- Siderable depth would necessarily be sufficient to also carry up the shot or milling ma- 4o terial therewith. This is especially true of holes of large diameter. In carrying out my improved process I regulate the force of water so as to carry'T up the millings or grindings a predetermined distance only, and hence the force or head of water employed may be substantially the same regardless of the depth of the hole.- I then catch `the material so carried upward at a point intermediate the bottom and top of the hole, and thus prevent the 5o same from falling back and clogging or jamming the drill-head.

Serial No. 71,287. (No specimens.)

In the drawing herewith, and which forms a part of this specification, I have shown such portions of an apparatus as is necessary for a complete understanding of my invention and with which my improved process may be carried out. p

Figure'l therein is a View in vertical sectional elevation of a drill as it would appear' at work boring in the earths strata and with 6o which my improved process may be carried out. Fig. 2 is an enlarged sectional detail View of a portion of the same, taken at the foot of the hole.

The boring-rod l therein shown is preferably hollow, and is connected at its upper end with a suitable swivel 2 and a waterA connection 3. Suitable rotating apparatus (not shown herein) will be applied to the boringrod in order to rotate same in a manner well 7o known. The lower end of the hollow boring- ,rod is provided with a boring-head 4, suitable for receiving and rotating a free or loose material, (designated by the reference character 5.) This free or loose material is 'commonly 75 called shot in the art, and preferably comprises a number of small chilledfiron spheres, and the rotation of the boring-head 4 produces a milling or grinding action upon the rock or similar material through the medium thereof. 8o So far the apparatus is well known and commonly used in the art.

Water is forced through the hollow boringrod l, through the water connection 3, and the swivelhead 2, and the same passes through the boring-head 4 and up around the -boring-head and the boring-rod, carrying with it the millings or grindings. The force or pressure of this water must not be suiicient to carry away the milling or grinding 9o material 5, and the limit of depth to which the hole has been made under the shot system prior to my invention has been reached when the force of water required to carry the millings or 4grindings upto the surface 95 has substantially reachedthe point at which the milling or grinding material would also be carried up. In my process, however, I

do not attempt to apply a suicient force of water to carry the millings or grindings up roo to the surface of the hole after the latter has reached a predetermined depth, but merely apply a sufiicient force to carry them a part of the way up, and I then catch them at a point intermediate of the bottom and the top of the hole. For this purpose I provide any suitable receiver, and have herein shown a cup 6, carried by the drill rod and head, and in which the grindings or millings may be received. By this means I am enabled to carry the hole down to an indefinite depth, for the force of water has no relationship to the depth of the hole.

I do not desire, of course, to be limited to Ithis particular form of apparatus shown and described, as the apparatus in itself forms no part of the present invention, the invention herein residing entirely in a new and improved process.

The herein described process of boring holes in rock, or similar material in the carths strata, which consists in milling or grinding the same with a free or loose material, introducing water under pressure into the hole to carry up the millings or grindings, and, after the hole has reached a predetermined depth, maintaining a substantially uniform pressure upon the Water at the bottom of the hole, regardless of the. 

